use std::collections::HashMap;

pub fn main() {
    let mut HashMap1 = HashMap::new();
    HashMap1.insert("a", 1);
    HashMap1.insert("b", 2);
    HashMap1.insert("c", 3);


    let a = HashMap1.get("a").unwrap();
    println!("{}", a);

    for (key, value) in HashMap1 {
        println!("{}: {}", key, value);
    }
}